What is time travel? It is possible... theoretically.

What is time travel?
This concept is defined as moving between points in time and space, using an invention obviously called Time Machine.

Time travel theories start with Einstein's theory of relativity, which states that in space and time, objects move forward in time and from side to side in space. And one aspect approved from that theory is that the nearer the object's speed is from the speed of light, the faster time will have passed in that object's point of view. Which is true, it has happened to all of us, but this phenomenon is not called time travel per se, it is just an actual fact that supports time travel in a way.

Many scientists confirm that time travel is impossible, because with a time machine we would be able to alter causality causing several paradoxes, a topic that I will explain in a future essay. Also, as Stephen Hawking states, the absence of future tourists in our time is a strong argument against time travel, but it could also be a safety measure, for future citizens, time travel might also be prohibited, so that could be the reason why no one comes.

If time travel were to be possible, there are also some theories that limit time traveling. One of them is the fact that, if a time machine was invented, the farthest we would be able to travel back would be the very moment the machine was created, unless any other civilization created a time machine after us, then we would be able to travel farther in time until the invention of their machine. The other theory is that if you traveled back in time, you wouldn't be traveling to your past, but to a parallel universe in where your actions would interfere changing the course of causality creating an alternate universe to the one you came from.

There are several theories which support time travel, the most known one is the wormhole. Let's pretend that time and space are represented by a sheet of paper, and we are placed somewhere in that paper. If we were to fold that sheet of paper in half, the space that gets placed directly below or above us in that space and time continuum would be the other side of the tunnel the wormhole would lead us to. Depending on how we "folded" that paper, we would be able to travel wherever we wanted.

These are the basics of time travel, some facts and theories that contradict and support time travel. Next time I'll write about paradoxes, which is a very interesting topic in my opinion.